fix: execaccessrequest was broken due to bogus test code

[diranged]

while testing some local dev stuff, i broke the execaccessrequest webhook. this was not caught because the contextual defaulter was ignoring the err that was returned.

closes #54

[coveralls]

Pull Request Test Coverage Report for Build 3616819404

• 7 of 9 (77.78%) changed or added relevant lines in 2 files are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.2%) to 44.748%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
webhook/contextual_defaulter.go	5	7	71.43%

Files with Coverage Reduction	New Missed Lines	%
api/v1alpha1/utils.go	4	0%

Totals
Change from base Build 3605176902:	-0.2%
Covered Lines:	852
Relevant Lines:	1904

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💛 - Coveralls